Use undefined, not null, to satisfy linter
Use undefined, not null, to satisfy linter

jwbay/TypeScript,weswigham/TypeScript,TukekeSoft/TypeScript,alexeagle/TypeScript,mihailik/TypeScript,RyanCavanaugh/TypeScript,TukekeSoft/TypeScript,minestarks/TypeScript,erikmcc/TypeScript,chuckjaz/TypeScript,kpreisser/TypeScript,chuckjaz/TypeScript,kpreisser/TypeScript,nojvek/TypeScript,basarat/TypeScript,kitsonk/TypeScript,thr0w/Thr0wScript,basarat/TypeScript,jwbay/TypeScript,nojvek/TypeScript,jwbay/TypeScript,microsoft/TypeScript,SaschaNaz/TypeScript,chuckjaz/TypeScript,DLehenbauer/TypeScript,DLehenbauer/TypeScript,Eyas/TypeScript,jeremyepling/TypeScript,synaptek/TypeScript,donaldpipowitch/TypeScript,mihailik/TypeScript,alexeagle/TypeScript,kpreisser/TypeScript,DLehenbauer/TypeScript,jeremyepling/TypeScript,vilic/TypeScript,thr0w/Thr0wScript,mihailik/TypeScript,nojvek/TypeScript,jwbay/TypeScript,thr0w/Thr0wScript,basarat/TypeScript,erikmcc/TypeScript,Eyas/TypeScript,donaldpipowitch/TypeScript,mihailik/TypeScript,weswigham/TypeScript,jeremyepling/TypeScript,SaschaNaz/TypeScript,minestarks/TypeScript,SaschaNaz/TypeScript,minestarks/TypeScript,Microsoft/TypeScript,donaldpipowitch/TypeScript,alexeagle/TypeScript,nojvek/TypeScript,microsoft/TypeScript,SaschaNaz/TypeScript,erikmcc/TypeScript,vilic/TypeScript,synaptek/TypeScript,synaptek/TypeScript,vilic/TypeScript,thr0w/Thr0wScript,Eyas/TypeScript,RyanCavanaugh/TypeScript,kitsonk/TypeScript,RyanCavanaugh/TypeScript,vilic/TypeScript,Microsoft/TypeScript,kitsonk/TypeScript,synaptek/TypeScript,TukekeSoft/TypeScript,DLehenbauer/TypeScript,weswigham/TypeScript,microsoft/TypeScript,Microsoft/TypeScript,Eyas/TypeScript,erikmcc/TypeScript,donaldpipowitch/TypeScript,basarat/TypeScript,chuckjaz/TypeScript